nibbler:~# uname -a
Linux nibbler.little-isp.de 2.6.16-026test017 #2 SMP Tue Aug 29 18:24:23 CEST 2006 i686 GNU/Linux

nibbler:~# vzctl start 1002
Starting VPS ...
VPS is mounted
Setting CPU units: 1000
Setting devices
Set hostname: etch
VPS start in progress...

nibbler:~# mount /dev/backup/src /var/lib/vz/private/1002/usr/src/
nibbler:~# ls /var/lib/vz/private/1002/usr/src/
[... lots of directories ...]

nibbler:~# vzctl enter 1002
entered into VPS 1002
etch:/# ls /usr/src/
etch:/#

nibbler:~# mount /dev/backup/src /var/lib/vz/private/1002/usr/src/
nibbler:~# vzctl start 1002
Starting VPS ...
vzquota : (error) Quota on syscall for 1002: Device or resource busy
vzquota on failed [3]